More Bass for Your Home Theater and Music
Monitor XT12 provides Polk’s loud, low, effortless bass so you can enjoy movies, music and gaming with more impact and excitement. Easily integrated into any home theater or music listening environment, and featuring new woofer, amplifier, and cabinet designs—the affordably priced MXT12 fulfills the Polk promise of great sound for all.

We Make Loud and Low Seem Effortless
Polk has always been known for speakers that produce deep, powerful, effortless bass, and the MXT12 is no exception. A big, 12” Dynamically Balanced woofer in a ported cabinet, powered by a clean and ultra-efficient Class A/B amplifier delivers bass as low as 24Hz, adding more punch and impact to your favorite music, movies and video games.

Built to withstand the rumble
When you want bass this loud and this low your subwoofer needs more than a great woofer and powerful amplifier to make it seem effortless. Monitor XT12 is housed in a critically braced MDF cabinet with a removable, precision-fit grille to isolate the sound of the woofer while minimizing unwanted resonances and sonic interference.

Add massive bass, seamlessly to your home theater
Monitor X12 features a consistently variable crossover, polarity and volume control to blend the massive bass it provides, seamlessly with your system. In addition, MXT12 offers line level, LFE, and nickel plated binding post inputs, ensuring compatibility with your receiver. Plus, the MXT12 is perfect for the modern trend of integrating two subs into your home theater, for even more bass, while smoothing out the low frequencies throughout the room.

Consistent sound throughout the series
The Monitor XT Series was designed with quality, timbre consistent components throughout to enable you to mix and match models to build your dream home theater or music listening set up. Matched components provide a unified sound field with seamless speaker-to-speaker blending for truly immersive listening experiences.

Product info:
Featured in our article: Best budget powered subwoofers for 2026
12″ long-throw, high-excursion driver
bi-laminate paper woofer with foam surround
built-in 50-watt RMS Class AB amplifier (100-watt peak)
bass-reflex (ported) enclosure
braced MDF cabinet minimizes resonance for clean bass
frequency response: 24-160 Hz
low-pass crossover: 80-160 Hz
phase switch: 0/180°
line-level stereo RCA input
spring clip speaker-level input and output
engineered and designed in the USA
16-1/16″W x 16-7/16″H x 19-1/16″D
weight: 39 lbs.
warranty: 5 years (woofer), 3 years (amplifier)